A disclosed wearable portable terminal having straps comprising a battery comprises: a display having a screen, on which an image is displayed, and a rear side, which faces a portion to be worn, as the back side of the screen; straps respectively coupled to both sides of the display so as to fix the display to the portion to be worn; and a power source unit having a plurality of unit power sources sequentially arranged along a lengthwise direction of the straps and provided on the straps in a detachable manner, wherein the plurality of unit power sources are connected to each other in parallel so as to supply power to the display.

A method for operating a power supply circuit of a communications device involves operating the power supply circuit in a first operating mode in which a switching frequency of the power supply circuit is higher than an operating frequency band of the communications device and switching the power supply circuit to operate in a second operating mode in response to connecting the power supply circuit to a battery by decreasing the switching frequency of the power supply circuit.

A method for operating a power supply circuit of a communications device involves operating the power supply circuit in a first operating mode in which a switching frequency of the power supply circuit is higher than an operating frequency band of the communications device and switching the power supply circuit to operate in a second operating mode in response to connecting the power supply circuit to a battery by decreasing the switching frequency of the power supply circuit.

A centralized theft-proof device includes a main control, several sub-controls, and optionally a remote control. The main control includes a process, a display, a wireless receiver, and an alarm, and each sub-control includes a SCM and several interfaces connected to the SCM. The processor and SCM are in series connection. The processor is electrically connected to the display, the wireless receiver, and the alarm, respectively. The main control is connected to at least one adapter, and each sub-control is connected to at least one adapter.

A centralized theft-proof device includes a main control, several sub-controls, and optionally a remote control. The main control includes a process, a display, a wireless receiver, and an alarm, and each sub-control includes a SCM and several interfaces connected to the SCM. The processor and SCM are in series connection. The processor is electrically connected to the display, the wireless receiver, and the alarm, respectively. The main control is connected to at least one adapter, and each sub-control is connected to at least one adapter.

A method for controlling power supply and a system are disclosed. The method includes: receiving an idle communication indicative instruction sent by a field energy supply device through a communication path; sending a waiting time extension instruction to the field energy supply device through the communication path, to instruct the field energy supply device to supply field energy continuously; and receiving a response to the waiting time extension instruction sent by the field energy supply device through the communication path, closing the communication path, and supplying with power by utilizing the field energy through a power supply path.

Aspects of the subject disclosure may include, for example, apparatus that includes a first port that receives a radio frequency signal input, a second port that provides a high-speed Internet connection and the radio frequency signal input and receives a power supply current, and a third port that receives the high-speed Internet connection and receives the power supply current and that the first port is isolated from the power supply current. Other embodiments are disclosed.

A reverse power feeding PSE in electrical communication with a DPU, the PSE constituted of: a control circuitry; and a detection and classification signal circuitry, arranged to: output a detection signal; output a classification signal; and output an additional signal exhibiting a voltage below an operating range, and wherein the control circuitry is arranged to: responsive to the output first detection signal, detect a valid signature resistance; responsive to the output first classification signal, receive a classification current and determine the class of the DPU; responsive to the output additional signal, detect the absence, or presence, of an off-hook phone; responsive to the detection of the absence of an off-hook phone, and further responsive to the detection of the valid signature resistance, output power exhibiting a voltage within the operating range; and responsive to the detection of the presence of an off-hook phone, not output power.

A reverse power feeding PSE in electrical communication with a DPU, the PSE constituted of: a control circuitry; and a detection and classification signal circuitry, arranged to: output a detection signal; output a classification signal; and output an additional signal exhibiting a voltage below an operating range, and wherein the control circuitry is arranged to: responsive to the output first detection signal, detect a valid signature resistance; responsive to the output first classification signal, receive a classification current and determine the class of the DPU; responsive to the output additional signal, detect the absence, or presence, of an off-hook phone; responsive to the detection of the absence of an off-hook phone, and further responsive to the detection of the valid signature resistance, output power exhibiting a voltage within the operating range; and responsive to the detection of the presence of an off-hook phone, not output power.

In one embodiment, a method includes receiving power delivered over a data fiber cable at an optical transceiver installed at a network communications device and transmitting data and the power from the optical transceiver to the network communications device. The network communications device is powered by the power received from the optical transceiver. An apparatus is also disclosed herein.